<?php
class SubPages{

  private  $each_disNums;//每页显示的条目数
  private  $nums;//总条目数
  private  $current_page;//当前被选中的页
  private  $sub_pages;//每次显示的页数
  private  $pageNums;//总页数
  private  $page_array = array();//用来构造分页的数组
  private  $subPage_link;//每个分页的链接
  private  $subPage_type;//显示分页的类型
  private  $bar;
   /*
   __construct是SubPages的构造函数，用来在创建类的时候自动运行.
   @$each_disNums   每页显示的条目数
   @nums     总条目数
   @current_num     当前被选中的页
   @sub_pages       每次显示的页数
   @subPage_link    每个分页的链接
   @subPage_type    显示分页的类型

   当@subPage_type=1的时候为普通分页模式
         example：   共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
         当@subPage_type=2的时候为经典分页样式
         example：   当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
   */
  function __construct($each_disNums,$nums,$current_page,$sub_pages,$subPage_link,$subPage_type){
   $this->each_disNums=intval($each_disNums);
   $this->nums=intval($nums);
   $this->pageNums=ceil($nums/$each_disNums);
    if(!$current_page||$current_page<=0||$current_page>$this->pageNums){
    $this->current_page=1;
    }else{
    $this->current_page=$this->cleanOnlyNum(intval($current_page));
    }
   $this->sub_pages=intval($sub_pages);
   $this->subPage_link=$subPage_link;
   $this->show_SubPages($subPage_type);
   //echo $this->pageNums."--".$this->sub_pages;
  }

  public function cleanOnlyNum($input) {
		$clean = preg_replace('/[^0-9]/', '', $input);
		return $clean;
	}
  /*
    __destruct析构函数，当类不在使用的时候调用，该函数用来释放资源。
   */
  function __destruct(){
    unset($each_disNums);
    unset($nums);
    unset($current_page);
    unset($sub_pages);
    unset($pageNums);
    unset($page_array);
    unset($subPage_link);
    unset($subPage_type);
   }

  /*
    show_SubPages函数用在构造函数里面。而且用来判断显示什么样子的分页
   */
  function show_SubPages($subPage_type){
    if($subPage_type == 1){
    $this->bar = $this->subPageCss1();
    }elseif ($subPage_type == 2){
    $this->bar = $this->subPageCss2();
    }
   }
  function showBar(){

	  return $this->bar;

	  }
  function getLimt(){

	return $this->each_disNums*($this->current_page-1);

      }

  /*
    用来给建立分页的数组初始化的函数。
   */
  function initArray(){
    for($i=0;$i<$this->sub_pages;$i++){
    $this->page_array[$i]=$i;
    }
    return $this->page_array;
   }


  /*
    construct_num_Page该函数使用来构造显示的条目
    即使：[1][2][3][4][5][6][7][8][9][10]
   */
  function construct_num_Page(){
    if($this->pageNums < $this->sub_pages){
    $current_array=array();
     for($i=0;$i<$this->pageNums;$i++){
     $current_array[$i]=$i+1;
     }
    }else{
    $current_array=$this->initArray();
     if($this->current_page <= 3){
      for($i=0;$i<count($current_array);$i++){
      $current_array[$i]=$i+1;
      }
     }elseif ($this->current_page <= $this->pageNums && $this->current_page > $this->pageNums - $this->sub_pages + 1 ){
      for($i=0;$i<count($current_array);$i++){
      $current_array[$i]=($this->pageNums)-($this->sub_pages)+1+$i;
      }
     }else{
      for($i=0;$i<count($current_array);$i++){
      $current_array[$i]=$this->current_page-2+$i;
      }
     }
    }

    return $current_array;
   }

  /*
   构造普通模式的分页
   共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
   */
  function subPageCss1(){
   $subPageCss1Str="";
   $subPageCss1Str.="共".$this->nums."条记录，";
   $subPageCss1Str.="每页显示".$this->each_disNums."条，";
   $subPageCss1Str.="当前第".$this->current_page."/".$this->pageNums."页 ";
    if($this->current_page > 1){
    $firstPageUrl=$this->subPage_link."1";
    $prewPageUrl=$this->subPage_link.($this->current_page-1);
    $subPageCss1Str.="[<a href='$firstPageUrl'>首页</a>] ";
    $subPageCss1Str.="[<a href='$prewPageUrl'>上一页</a>] ";
    }else {
    $subPageCss1Str.="[首页] ";
    $subPageCss1Str.="[上一页] ";
    }

    if($this->current_page < $this->pageNums){
    $lastPageUrl=$this->subPage_link.$this->pageNums;
    $nextPageUrl=$this->subPage_link.($this->current_page+1);
    $subPageCss1Str.=" [<a href='$nextPageUrl'>下一页</a>] ";
    $subPageCss1Str.="[<a href='$lastPageUrl'>尾页</a>] ";
    }else {
    $subPageCss1Str.="[下一页] ";
    $subPageCss1Str.="[尾页] ";
    }

    return $subPageCss1Str;

   }


  /*
   构造经典模式的分页
   当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
   */
  function subPageCss2(){
   $subPageCss2Str="";
   $subPageCss2Str.="当前第".$this->current_page."/".$this->pageNums."页 ";


    if($this->current_page > 1){
    $firstPageUrl=$this->subPage_link."1";
    $prewPageUrl=$this->subPage_link.($this->current_page-1);
    $subPageCss2Str.="[<a href='$firstPageUrl'>首页</a>] ";
    $subPageCss2Str.="[<a href='$prewPageUrl'>上一页</a>] ";
    }else {
    $subPageCss2Str.="[首页] ";
    $subPageCss2Str.="[上一页] ";
    }

   $a=$this->construct_num_Page();
    for($i=0;$i<count($a);$i++){
    $s=$a[$i];
     if($s == $this->current_page ){
     $subPageCss2Str.="[<span style='color:#BADC00;font-weight:bold;'>".$s."</span>]&nbsp;";
     }else{
     $url=$this->subPage_link.$s;
     $subPageCss2Str.="[<a href='$url'>".$s."</a>]&nbsp;";
     }
    }

    if($this->current_page < $this->pageNums){
    $lastPageUrl=$this->subPage_link.$this->pageNums;
    $nextPageUrl=$this->subPage_link.($this->current_page+1);
    $subPageCss2Str.=" [<a href='$nextPageUrl'>下一页</a>] ";
    $subPageCss2Str.="[<a href='$lastPageUrl'>尾页</a>] ";
    }else {
    $subPageCss2Str.="[下一页] ";
    $subPageCss2Str.="[尾页] ";
    }
    return $subPageCss2Str;
   }
}
?>